Mike gives great advice. I, too, love beer. Once a week didn't work all that well for me--I had to go to once a month, more or less. You may have to tinker with how much you can get away with. Beer has lots of cals (especially the kind you and I seem to like) and of course alcohol messes with the liver which is also what metabolizes fat.

Other than that, just freakin' decide to do it, no matter what and git-r-done.